HSC 2821
0.17
UTI
0.0
CN
0.11
Cdens
0.62
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
20
Core radius and density
1.9 [pc], 0.6 [pc-2]
- CN 0.0 Sparse
- Cdens 0.11 Very loose
- CC3 0.62 Intermediate quality
- Clit 0.06 Rarely studied
- Cdup 1.0 Unique
đĨ Members
đ Colab
đŦ Bayestar19
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
Overview
HSC 2821 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It was recently reported in the literature.
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 248.131 | -43.131 | 1.338 | -0.438 | -5.094 | 3.652 |
| Hu & Soubiran | 2025 | 247.981 | -43.195 | â | â | â | â |
| Hunt & Reffert | 2024 | 248.07 | -43.141 | 1.366 | -0.457 | -5.086 | 0.185 |
| Cavallo et al. | 2024 | 247.981 | -43.195 | 1.367 | â | â | â |
| Hunt & Reffert | 2023 | 248.07 | -43.141 | 1.366 | -0.457 | -5.086 | 0.185 |
đĄ Note: The UCC values are estimated from its identified members.
| Reference | Year | Dist [kpc] | Av [mag] | DAv [mag] | Age [Myr] | [Fe/H] [dex] | Mass [Msun] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 0.7 | 1.2 | 0.26 | 141 | -0.205 | 93 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | 0.010(5) | â | â | â |
| Hunt & Reffert | 2024 | 0.70 | 1.20 | 0.26 | 141 | â | 93(1) | â | â |
| Cavallo et al. | 2024 | 0.67 | 0.91 | â | 513 | -0.420 | â | â | â |
| Hunt & Reffert | 2023 | 0.70 | 1.20 | 0.26 | 141 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).